TPS63050_14 Datasheet, PDF (1/35 Pages) Texas Instruments – Single Inductor Buck-Boost with 1A Switches and Adjustable Soft Start

TPS63050, TPS63051
SLVSAM8A – JULY 2013 – REVISED FEBRUARY 2014
TPS6305x Single Inductor Buck-Boost with 1A Switches and Adjustable Soft Start
1 Features
•1 Real Buck or Boost with Seamless Transition
Between Buck and Boost Mode
• 2.5V to 5.5V Input Voltage Range
• 0.5A Continuous Output Current : V_IN≥2.5V,
V_OUT=3.3V
• Adjustable and Fixed Output Voltage Version
• Efficiency >90% in Boost Mode and >95% in Buck
Mode
• 2.5MHz Typical Switching Frequency
• Adjustable Average Input Current Limit
• Adjustable Soft Start Time
• Device Quiescent Current Less Than 50μA
• Power Save Mode
• Load Disconnect During Shutdown
• Over-Temperature Protection
• Small 1.6mm x 1.2mm, 12-pin WCSP package
2 Applications
• Cellular Phones, Smart Phones
• Tablets PC
• PC and Smart Phone accessories
• Battery Powered Applications
3 Description
The TPS63050/1 are high efficiency, low quiescent
current buck-boost converters suitable for
applications where the input voltage is higher or lower
than the output. Output currents can go as high as
500mA in boost mode and as high as 1A in buck
mode. The maximum average current in the switches
is limited to a typical value of 1A. The TPS6305x
regulates the output voltage over the complete input
voltage range by automatically switching between
buck or boost mode depending on the input voltage
ensuring seamless transition between modes. The
buck-boost converter is based on a fixed frequency,
pulse-width-modulation (PWM) controller using
synchronous rectification to obtain highest efficiency.
At low load currents, the converter enters Power
Save Mode to maintain high efficiency over the
complete load current range. There is a PFM/PWM
pin that allows the user to choose between automatic
PFM/PWM mode operation and forced PWM
operation. During PWM mode a fixed-frequency of
typically 2.5MHz is used. The output voltage is
programmable using an external resistor divider, or is
fixed internally on the chip. The converter can be
disabled to minimize battery drain. During shutdown,
the load is disconnected from the battery. (The device
is packaged in a 12-pin WCSP package measuring
1.6mm × 1.2mm).
Device Information
ORDER NUMBER PACKAGE (PIN) BODY SIZE
TPS63050YFF
TPS63051YFF
DSBGA (12)
1,56mm x 1,16mm
4 Simplified Schematic
V_IN
2.5 V to 5.5 V
C₁
10µF
L₁ 1.5 µH
V_IH or V_IL
TPS63051
L1
L2
VIN
VOUT
EN
FB
ILIM0
PFM/
PWM
GND
PG
ILIM1
SS
R₂
1MΩ
V_IH or V_IL
C₃
1nF
V_OUT
3.3 V /500m A
C₂
10µF
ILIM0
Low
ILIM1
Current
LIMIT set
Low
0.4*IIN_MAX
High
Low
0.5*IIN_MAX
Low
High 0.65*IIN_MAX
High
High
IIN_MAX
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.